Lock-in elimination by orthogonal polarization in semiconductor Ring Laser Gyroscope
01 Dec 2015-pp 258-260
TL;DR: In this paper, the authors proposed a method to eliminate the lock-in in a Semiconductor Fiber Ring Laser Gyroscope by orthogonally polarizing the counter-traveling waves in the ring cavity.
Abstract: We propose a novel method to eliminate the lock-in in a Semiconductor Fiber Ring Laser Gyroscope by orthogonally polarizing the counter-traveling waves in the ring cavity. Orthogonal polarization reduces the coupling between the waves which prevents them from locking.
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TL;DR: In this paper, the effect of a plate of anisotropic material such as a crystal on a collimated beam of polarized light may always be represented mathematically as a linear transformation of the components of the electric vector of the light.
Abstract: The effect of a plate of anisotropic material, such as a crystal, on a collimated beam of polarized light may always be represented mathematically as a linear transformation of the components of the electric vector of the light. The effect of a retardation plate, of an anisotropic absorber (plate of tourmaline; Polaroid sheeting), or of a crystal or solution possessing optical activity, may therefore be represented as a matrix which operates on the electric vector of the incident light. Since a plane wave of light is characterized by the phases and amplitudes of the two transverse components of the electric vector, the matrices involved are two-by-two matrices, with matrix elements which are in general complex. A general theory of optical systems containing plates of the type mentioned is developed from this point of view.
1,706 citations
TL;DR: In this article, the general theory developed in Part I and the derivation of the matrices representing two optical elements which were not treated in Parts II and III are discussed. But the discussion is limited to monoclinic and triclinic crystals which do not possess optical activity.
Abstract: Part IV is divided into two sections. The first is devoted to some additions to the general theory developed in Part I, and the second section to the derivation of the matrices representing two optical elements which were not treated in Parts II and III: (1) plates possessing circular dichroism, and (2) plates cut from crystals of such low symmetry that the principal axes of absorption and refraction are not parallel. In case (2), the discussion is limited to monoclinic and triclinic crystals which do not possess optical activity.
1,316 citations
"Lock-in elimination by orthogonal p..." refers methods in this paper
...In order to represent the polarization of light waves and the transfer functions of polarization dependent elements we use the Jones Vectors [11]....
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...MATHEMATICAL REPRESENTATION The initial output of the SOA propagating in the z direction with angular frequency and propagation constant k can be represented as kztEE cos0 (1) In order to represent the polarization of light waves and the transfer functions of polarization dependent elements we use the Jones Vectors [11]....
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TL;DR: A review of active and passive ring laser devices is given in this paper, with special emphasis given to the problems associated with the achievement of greater sensitivity and stability with respect to the ring laser gyroscope.
Abstract: This paper presents a review of both active and passive ring laser devices. The operating principles of the ring laser are developed and discussed, with special emphasis given to the problems associated with the achievement of greater sensitivity and stability. First-principle treatments of the nature of quantum noise in the ring laser gyro and various methods designed to avoid low-rotation-rate lock-in are presented. Descriptions of state-of-the-art devices and current and proposed applications (including a proposed test of metric theories of gravity using a passive cavity ring laser) are given.
562 citations
TL;DR: In this paper, it was shown that any optical system which contains only retardation plates and rotators is optically equivalent to a system containing only two plates, one a retardation plate, and the other a rotator.
Abstract: The general theory developed in Part I is used to prove three equivalence theorems about optical systems of the type under discussion. We prove that any optical system which contains only retardation plates and rotators is optically equivalent to a system containing only two plates—one a retardation plate, and the other a rotator. We then prove an exactly analogous theorem for systems containing only partial polarizers and rotators. Finally, it is proved that the most general optical system which contains any number of all three types of plates is optically equivalent to a system containing at most four plates—two retardation plates, one partial polarizer, and one rotator.
457 citations
TL;DR: Theoretical results on wave mixing in traveling-wave semiconductor laser amplifiers are presented in this article, where the authors derive equations capable of treating the range from nearly degenerate to highly nondegenerate four-wave mixing.
Abstract: Theoretical results on wave mixing in traveling-wave semiconductor laser amplifiers are presented. Starting from rather general density-matrix equations, including the effects of carrier-density pulsations, carrier heating, and spectral-hole burning, we derive equations capable of treating the range from nearly degenerate to highly nondegenerate four-wave mixing. The equations are solved numerically, and comparison to published experimental results is made. The theoretical results explain different experimental results, which have been taken to support either the role of spectral-hole burning or that of carrier heating in mediating wave mixing under highly nondegenerate conditions. >
267 citations